:^/ One trick that works for older hardware is to reset the BIOS settings by removing the real time clock battery for a few minutes before re-installing it. Mind you, that will reset all of its settings, and not just the passwords. It also requires opening up things that may have warranty seals on them, and may void your warranty. Only try that as a last resort.

Also, take the time to write down all of the BIOS settings that you can access, because you may need to reset some of them afterward. Also, consider that modern hardware may be less easily corrected. If the settings are in flash ROM instead of volatile RAM, you may need to use software to erase the current settings.

i have the same problem. after clearing the user password in the bios the ask for a user password and the old user password is not accepted. And the admin password which is not changed does he not accept too. :(((( It seems to a bios problem